I've never owned a japanese street bike that, no matter how neglected, couldn't be 100% rideable after a good tune up and lube, carb cleaning, new tires, a chain, a battery, and maybe a new set of clutch plates. Now I'll admit that these weren't sport bikes for the most part, but plenty of inline fours. Thats not saying that there aren't clapped out junk bikes out there; I think we'll all agree on that. Just keep in mind that jap bikes are tough and can take some abuse. I used to flog the snot out of my 1982 XS850 Special, which had 48,000 miles when I bought it. The oil looked like tar, the tires were bald, and it wouldn't hardly move under it's own power (caused by carbs full of gunk and a mouse nest in the air filter). A couple hundred dollars and a few late nights later it ran like a dream, rode great, and stayed that way for two years until I sold it. I agree with offering the guy $2500.